Question: Tell me about sovereign state for diplomatic relation of Soviet Union?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q15180 wdt:P530 ?obj . ?obj wdt:P31 wd:Q3624078 } 
Answer: Tonga, Vanuatu, Grenada, Israel, Laos, Malaysia, Pakistan, Angola, Philippines, Ivory Coast, Canada, Japan, Norway, United States of America, Denmark, Turkey, Germany, Romania, Cuba